Host‐specific acrothoracid barnacles on Middle Devonian platyceratid gastropods
Host‐specific acrothoracid barnacles on Middle Devonian platyceratid gastropods
复制标题
中泥盆世扁角腹足动物的寄主特异性藤壶
DOI：
10.1080/08912969009386544
复制
发表时间：
1990
影响因子：
1.4
通讯作者：
J. Tomlinson
中科院分区：
文献类型：
--
作者：
G. Baird;C. Brett;J. Tomlinson
钻孔虫属于胸上藤壶类，产于纽约西部中泥盆世汉密尔顿群的腹足类腹足类Naticonema lineata(Conrad)上，很少见于早泥盆世的标本。后者是化石记录中已知的最古老的顶酸钻孔。钻头一直发育成侧向压缩的、不等边的袋状物，专门分布在这些腹足类动物身上，通常是密集的寄生虫。Naticonema产生钻孔的贝壳通常与部分关节的脊椎骨遗骸有关，有时发现它们附着在脊椎动物身上的方式类似于共食性扁平脊椎动物。除了藤壶的钻孔外，Naticonema贝壳通常还带有苔藓虫的薄壳，通常会被这些钻孔穿孔，但有时也会过度生长。藤壶使活体宿主感到厌烦；腹足类通过在井底产生囊状的方解石二次分泌物来阻止贝壳穿透。这些东西的相对古老。
Borings, attributed to acrothoracic barnacles, occur on the platyceratid gastropod Naticonema lineatum (Conrad) from the Middle Devonian Hamilton Group of western New York and rarely in specimens as old as the Early Devonian. These latter are the oldest known acrothoracid borings are in the fossil record. The borings are consistently developed as laterally compressed, inequilateral pouches exclusively on these gastropods, commonly as dense infestations. Naticonema shells yielding borings typically occur associated with partially articulated qrinoid remains, and they are sometimes found attached to crinoids in a manner similar to coprophagous Platyceras. In addition to barnacle borings, Naticonema shells often bear thin encrustations of bryozoans which are usually perforated by these borings but sometimes also overgrow them. Barnacles bored live hosts; gastropods prevented shell penetration by producing cyst‐like secondary secretions of calcite beneath acrothoracid boreholes. The relative antiquity of thes...